"I started a brand new aquaponics system with 2 - 60sf rafts and 1 - 175gal bin tank, washed well. I started with well water which I chlorinated and then circulated for three or four days. I then added eight 6-8' goldfish confined to the bin, about three weeks ago. Slowly, one by one, my fish are dying, my sixth died today. I found a small dark worm, maybe one or two ml long visible under the skin near the mouth. When I examined the fish internals, the ovaries were creamy white but the right ovary had a dark roundish spot about 4-5 ml in dia on the underside. It almost looked like a decay or open sore. Gills were bright red and all other internals looked fine. What killed this fish? The little dark worm-like thing is the first one I have noticed. All the other fish that croaked looked healthy, just dead. I did not open them up though. My water has no measurable ammonia, pH about 7.5, hardness is very high, and two bubblers in the bin. Please help. "

"BlackHawk"

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